Screen-vibrating mechanism



June 21,1927. 1,632,927

E. H- SHACKELFORD, JR

SCREEN VIBRATING MECHANISM Filed Aug. 5, 1926 2 Shets-Sheet 1 gwuentoz ml eyortl, Jr.

June 21 1927.

E. H. SHACKELFORD, JR I SCREEN VIBRATING MECHANI SM 2 Sheets-Sheet 2 Filed Aug. 5, 1926 Patented June 21, 1927.

UNITE o STATES EISWARD HA'sKrNs sHAcKE'LroRn, an, or J' oPL'inT, M ssouri, AssroNoR To HEIBB'ARD' MANUFACTURI'NG COMPANY, or Jerri-TN, mssevm; A CORPORATION or Mrsseem.

SCREEN-VIBRATING MECHANISM.

Application-filed August 5, 1926. Serial No.'127,3'14.

This invention relates tovibrating screens such, as are used with concentrators and paricularly to the means for glvlng vibration to the screen. V

The general object of the present invention isto provide a screen vibrating means including a reciprocating rod preferably operatedby an eccentric but not necessarily so, and means whereby the reciprocations of this rod may be transmitted to, the screen indirectly so that the reciprocating rod is not directly connected to the screen surface, and in this connection to provide spring cushioning means between the rod and the A further object is to provide means whereby the length ofstroke may headjusted and the force of impact controlled and thus secure a better action for the clean 111g of the screen surface. v p

c Other objects will appear in the course of the following description.

My invention is illustrated panying d rawings whereinz V c Figure 1 is a front elevation of ascreen vibrating mechanism constructed in accordance with my invention; a r

Fig. 2 is a section on the line 2-2 of Figure 1; v x I I F ig. 3 is a fragmentary elevationof the upper portion of the vibrating mechanism showing a slight modification.

in the accom- Referring tothese drawi gs 1O designates the screen frame upon which the screenl'l is supported, this screen beingofian'y usual or suitable character and held at edges by clamps 12 and tension r boltslSl' This screen niay be disposed in a vertical position, a horizontal position or any other desired position The screen frame includes two parallel angle irons'14.and;passing between; these angle irons is thee'ccentr1c rod 15 which, at Its upper end, is connected to the eccentric ring 16 operated by the centric 17. This rod 15, therefore, reciproin the crossbars 18 and 19iis the eccentric rod 15. The inner end of this eccentric rod carries the nut 23. Mounted upon thisnut is the head 24: and con'tronting the headf 24; is a head 25 which bears againstthe under face of the cross bar 19. Supported by these heads, which are flanged is the coiled conipre ssion spring 26. Disposed against the upper face of the cross bar 18' is the head 2 and confrontingthisrhead andmounted for adjustment upon the screw-threaded eccentric rod is the head.28, held in its adj'usted position by means of a nut 29. The l each-24 is also sOreW threaded u'pon'the rod.

isposed between the heads 27 and 28 is the coiled compression spring 30.

Connecting the. screen 11 and the cross bar 20 a screw-threaded connecting rod 31 w'h'ich has nuts engaging" the bar 20 and the screen; Disposed upon the upper and lower faces of the beams 14' are the rubber bumper blocks and83. Wl' ile I have de the eccentricshaft 36., these lugs Set provided with adjusting screws}? which engage the head 28 and resist upward movement of this head.

' t It will be particularly noted the eccentric rod is in no wayronnected to the screen cloth except through the action of h p n s d as b th answ of the nuts '22 the bumpers vor transverse bars 18 and 19 of the yoke can be adjusted closer to or further away from the rubber cushions 32 and33. This will increase or decrease the length of stroke or vibration of the screen. The length of thestroke and the ucts require different impacts and lengths of stroke. r

. In the operation of this mechanism it will be seen that a reciprocating action is given to the rod and when the rod moves upwarch the bumper block 19 will be forced against the rubber cushion 33 by meansfof the spring 26.. This upward'movement of the yoke moves the upper bumper or cross bar18 away from the rubber cushion 32. The lower bumper 19 strikes against the cushion and thiscauses a sudden stoppage of the upward movement of the screen. This stoppage occurs before the eccentric has reached its maximum upward movement and from this point there is an. interval of time beforethe eccentric reaches its maximum upward movement and the beginning of its downward movementwhich permits the material upon therscr'een surface to be jarred out of the screen openings. The distance the eccentric rod moves upward over the distance required to bring the bumper into contact with the rubber cushion is absorbed by the compression of spring 26. On the downward stroke of the eccentric rod, the tension upon spring 26 is relaxed and head 28 presses upon spring 30 which in turn presses against head 27 and bumper 18 which through the yokepresses the screen surface down and then'bumper 18 is suddenly stopped by rubber cushion 32, which stoppage vibrates the screen surface, jars particles through screen openings and spreads the material over the screen surface. The eccentric rod 15 has not yet reached its maximum downward movement when the bumper 18' has been Stopped by rubber cushion32 and its further downward move ment is absorbed by the compression of spring 30. This permits of an interval of time. before the upward movement of the The following description of'the working of the screen mechanism refers to the action of the mechanism as modified by the construction outlined in Figure 3.

In the operation of this mechanism it will be seen that a reciprocating action is given to the rod 15 and whenthe rod moves upupper bumper 18 moves away from the rubber cushion 32. The lower bumper 19 will strike against the cushion 33 "and this causes a sudden stoppage of the movement of the screen and vibrates the screen. On the downward stroke of the eccentric rod 15, the-tension onthe lower spring 26 is relaxed and the spring 30 now being stronger than V a the spring 26, forces the bumper 18 to strike the cushion 32, and a second jar is given to the screen.-

The particular merits of this mechanism lie in the exceptionally snappy action which is given to the screen surface brought about by the fact that upon the upward s movement of the eccentric rod, the screen is not onlyraised' but is stopped suddenly by the impact ofthe yoke against the rub.- ber cushion The result of this is that all material lying upon the screen and having a tendency to clog or remain in the screen openings is bumped out, thus preventing any clogging of the screen. This sudden jar. communicated to the screen gives the material upon the screen a rapid travel I1 acrossit and increases the capacity of the screen. This same action occurs upon the downward movement of the eccentric rod and thus two jars are given tothe screen' ates during the intervals of time for completing the eccentrics maximum upward and downward movements which operate to increase the efliciency and capacity over a screen surface simply pulled up and down with a straight eccentric movement.

1. In a mechanism of the character described an element to be reciprocated, a reciprocating rod, a yoke connected to the element and including a bumpin element through which the rod loose y passes, springs carried bythe rod and bearing against opposite faces of the bumping element to thus resiliently transmit movement of therod to saidyoke, and cushions disposed in the path of movement of said bumping element on'opposite sides thereof, the bumping element and the cushions being relatively adjustable toward or from each other.

2. In screen operating mechanism, a reciprocating rod, a yoke adapted to be connected to a member tobe reciprocated and including spaced parallel bumping members through which bumping members the rod loosely passes, springs carried by the rod and bearing against the opposite faces of the bumping members to thus resiliently transmit the movement of the rod to said yoke, and cushions disposed in the path of movement of said bumping members.

3. In screen operating mechanism, a reciprocating rod, a yoke adapted to be connected to a member to be reciprocated and including spaced parallel bumping members through which bumping members the rod loosely passes, springs carried by the rod and bearing against the opposite faces of the bumping members to thus resiliently transmit the movement of the rod to said yoke, and cushions disposed in the path of movement of said bumping members, the bump ing members being adjustable toward or away from each other and the cushions.

4. In a screen operating mechanism, a reciprocating rod, a yoke. adapted to be ad justably connected to a member to be reciprocated and including two parallel transversely extending bumpers, bolts connecting said bumpers whereby the bumpers may be adjusted toward or away from each other, oppositely disposed parallel beams extending between the bumpers and rigidly supported, the upper and lower faces of the beams carrying cushions, the reciprocating rod passing loosely through the bumpers, and coiled springs surrounding said rod above and below the bumpers and each bearing against the adjacent bumper, the tension of said springs being adjustable.

5. In a screen operating mechanism, a reciprocating rod, a yoke adapted to be adjustably connected to a member to be reciprocated and including two parallel tran versely extending bumpers, bolts connecting said bumpers whereby the bumpers may be adjusted toward or away from each other, oppositely disposed parallel beams extending between the bumpers and rigidly sup ported, the upper and lower faces of the beams carrying cushions, the reciprocating rod passing loosely through the bumpers, and coiled springs surrounding the rod and disposed above and below the bumpers and each bearing against one of the bumpers, and means for adjustably supporting the (ends of the springs remote from the ciprocating rod, a yoke adapted to be adjustably connected to a member to be reciprocated and including two parallel transversely extending bumpers, bolts connecting said bumpers whereby the bumpers may be adjusted toward or away from each other, oppositely disposed parallel beams extending between the bumpers and rigidly supported, the upper end and lower faces of the beams carrying cushions, the reciprocating rod passing loosely through the bumpers, and coiled springs surrounding the rod and disposed above and below the bumpers, and each bearing against one of the bumpers, means for supporting one of said springs comprising a head adjustably mounted upon the reciprocating rod, and means for adjustably supporting the end of the other spring remote from the bumper comprising lugs and screws passing through said lugs, and a head engaging the proximate end of a spring and against which said screws engage.

7. In screen operating mechanism, spaced cross beams, a shaft disposed above the beams, an eccentric mounted upon the shaft, an eccentric rod extending down between said beams, av yoke connected to theeccentric rod and adapted to be connected to a member adapted to be reciprocated, said yoke comprising a pair of spaced parallel bumpers disposed respectively above and below the cross beams, and a cross bar opera tively connected to the screen, bolts connecting said bumpers and the cross bar to each other and extending between the cross beams, the bumpers and the cross bar being adjustable toward or from each other'upon said bolts, rubber cushions mounted upon the cross beams and confronting the bumpers, a spring surrounding the lower end of the rod, upper and lower heads against which the opposite ends of the spring hear, one of said heads being adjustable to tension the spring, an upper coiled spring surrounding the upper portion of the eccentric rod and operatively supported at its lower end against the upper bumper, a head supporting the upper end of the spring, and means for adjusting said head toward or from the corresponding bumper to thereby tension the spring.

In testimony whereof I hereunto afiix my signature.

EDWARD HASKINS SHACKELFORD, Jr. 

